| 摘要 |
PURPOSE:To obtain a thermal recording material having excellent resistance to heat, light, water and organic solvents, and capable of forming a highly reliable developed color recorded image which can be read even in a near infrared region, by incorporating a specified catechol derivative and a ferric salt of an organic acid as main color forming components. CONSTITUTION:A thermal recording material comprises a catechol derivative of formula (I) and a ferric salt of an organic acid as main color forming components. Typical preferable examples of the organic acid for constituting the ferric salt include a carboxylic acid such as a fatty acid, particularly, a 10-22C carboxylic acid, a 4-20C dibasic fatty acid, and an iron salt of an amino acid, such as threonine-iron. When the thermal recording sheet is heated to about 100-300 deg.C, a dark brown or light brown developed color recorded image is formed which can be read in visible and near infrared regions. The recorded image is extremely excellent in resistance to heat and solvents and free of any discoloration under solar rays, and non-image areas have extremely excellent resistance to water, solvents, heat and light. |
